blob: a7cbbadbb5aa1811d9193e7e2ef3afba16b40818 [file] [log] [blame]
// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/filter/gzip_source_stream.h"
#include <algorithm>
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "base/test/fuzzed_data_provider.h"
#include "net/base/io_buffer.h"
#include "net/base/test_completion_callback.h"
#include "net/filter/fuzzed_source_stream.h"
// Fuzzer for GzipSourceStream.
//
// |data| is used to create a FuzzedSourceStream.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
net::TestCompletionCallback callback;
base::FuzzedDataProvider data_provider(data, size);
std::unique_ptr<net::FuzzedSourceStream> fuzzed_source_stream(
new net::FuzzedSourceStream(&data_provider));
// Gzip has a maximum compression ratio of 1032x. While, strictly speaking,
// linear, this means the fuzzer will often get stuck. Stop reading at a more
// modest compression ratio of 10x, or 2 MiB, whichever is larger. See
// https://crbug.com/921075.
size_t max_output =
std::max(10u * size, static_cast<size_t>(2 * 1024 * 1024));
const net::SourceStream::SourceType kGzipTypes[] = {
net::SourceStream::TYPE_GZIP, net::SourceStream::TYPE_DEFLATE};
net::SourceStream::SourceType type =
data_provider.PickValueInArray(kGzipTypes);
std::unique_ptr<net::GzipSourceStream> gzip_stream =
net::GzipSourceStream::Create(std::move(fuzzed_source_stream), type);
size_t bytes_read = 0;
while (true) {
scoped_refptr<net::IOBufferWithSize> io_buffer =
base::MakeRefCounted<net::IOBufferWithSize>(64);
int result = gzip_stream->Read(io_buffer.get(), io_buffer->size(),
callback.callback());
// Releasing the pointer to IOBuffer immediately is more likely to lead to a
// use-after-free.
io_buffer = nullptr;
result = callback.GetResult(result);
if (result <= 0)
break;
bytes_read += static_cast<size_t>(result);
if (bytes_read >= max_output)
break;
}
return 0;
}